tff.framework.DataExecutor

The data executor is responsible for the data building block.

tff.framework.DataExecutor(
    target_executor: executor_base.Executor,
    data_backend: tff.framework.DataBackend
)

Args
`target_executor`	Downstream executor that this executor delegates to.
`data_backend`	The data backend responsible for materializing payloads.

Raises
`TypeError`	if arguments are of the wrong types.

Methods

close()

Release resources associated with this Executor, if any.

If the executor has one or more target Executors, implementation of this method must close them.

create_call(
    comp, arg=None
)

A coroutine that creates a call to comp with optional argument arg.

Args
`comp`	The computation to invoke. It must have been first embedded in the executor by calling `create_value()` on it first.
`arg`	An optional argument of the call, or `None` if no argument was supplied. If it is present, it must have been embedded in the executor by calling `create_value()` on it first.

Returns
An instance of `ExecutorValue` that represents the constructed call.

create_selection(
    source, index
)

A coroutine that creates a selection from source.

Args
`source`	The source to select from. The source must have been embedded in this executor by invoking `create_value()` on it first.
`index`	An integer index to select.

Returns
An instance of `ExecutorValue` that represents the constructed selection.

create_struct(
    elements
)

A coroutine that creates a tuple of elements.

Args
`elements`	A collection of `ExecutorValue`s to create a tuple from. The collection may be of any kind accepted by `structure.from_container`, including dictionaries and lists. The `ExecutorValues` in the container must have been created by calling `create_value` on this executor.

Returns
An instance of `ExecutorValue` that represents the constructed tuple.

create_value(
    value, type_spec=None
)

Creates a value in this executor.

The following kinds of value are supported as the input:

An instance of a TFF computation proto that represents a data building block, to be handled natively by this executor.
Anything that is supported by the target executor (as a pass-through).
A nested structure of any of the above.

Args
`value`	The input for which to create a value.
`type_spec`	An optional TFF type of `value`.

Returns
A value embedded in the target executor.